Shaping core dynamos in A-type stars: The role of dipolar fossil fields J. P. Hidalgo, P. J. Käpylä, D. R. G Schleicher, C. A. Ortiz-Rodríguez and F. H. Navarrete A&A, 699 (2025) A250 Published online: 10 July 2025 DOI: 10.1051/0004-6361/202555151